<template>
<el-container class="home-container">
<!--  头部-->
  <el-header>
    <div>
      <img src="../assets/heima.png" alt="">
      <span>电商后台管理系统</span>
    </div>
    <el-button type="info" @click="logout">退出</el-button>
  </el-header>
<!--  页面主体-->
  <el-container>
<!--    侧边栏-->
    <el-aside :width="isCollapse ? '64px' : '200px'">
      <div class="toggle-button" @click="toggleCollapse">|||</div>

<!--侧边栏菜单区域-->
      <el-menu
        background-color="#333744"
        text-color="#fff"
        active-text-color="#409eff"
        unique-opened
        :collapse="isCollapse"
        :collapse-transition="false"
        router
        :default-active="activePath"
      >

<!--一级菜单-->
        <el-submenu
          :index="item.id + ''"
          v-for="item in menulist"
          :key="item.id"
        >
<!--一级菜单模板-->
          <template slot="title">
            <i class="el-icon-s-help"></i>
            <span>{{item.authName}}</span>
          </template>

<!--二级菜单-->
          <el-menu-item
            :index="'/' + subItem.path + ''"
            v-for="subItem in item.children"
            :key="subItem.id"
            @click="saveNavState('/' + subItem.path)"
          >
<!--二级菜单模板-->
            <template slot="title">
              <i class="el-icon-menu"></i>
              <span>{{subItem.authName}}</span>
            </template>
          </el-menu-item>
        </el-submenu>
      </el-menu>
    </el-aside>
<!--右侧内容主体-->
    <el-main>
      <router-view></router-view>
    </el-main>
  </el-container>
</el-container>
</template>

<script>
export default {
  data () {
    return {
      menulist: [],
      isCollapse: false,
      activePath: ''
    }
  },
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    async getMenuList () {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
    },
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>

.home-container {
  height: 100%;
}

.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}

.el-aside {
  background-color: #333744;
  .el-menu {
    border-right: none;
  }
}

.el-main {
  background-color: #eaedf1;
}

.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  text-align: center;
  color: #fff;
  letter-spacing: .2em;
  cursor: pointer;
}
</style>
